Client:
Jumeirah Bay Project
Consultant:
Cracknell
Main Contractor:
Pearl Garden Landscape and Irrigation Services
Main Contractor:
Union Dredgers and Marine Contracting
Project Year:
2023
Scope of the Project
- Supply of necessary HDPE pipes, fittings, concrete ballast blocks and bolts
- Dredging for trenches
- Installation of storm water outfalls in five locations
- Testing and commissioning
Union Dredgers successfully completed the commissioning of five storm water outfall pipelines. UDMCs scope of work included:
- Supply of OD 400mm and 315mm HDPE pipes and fittings
- Supply of concrete ballast blocks, nuts and bolts
- Butt fusion welding of storm water spools
- Offshore dredging and intertidal zone excavation
- Removal and reinstatement of revetment
Project Scope and Execution
- Welding of HDPE Pipes: The project began with the welding of 1600mm HDPE pipes, a crucial step in ensuring the structural integrity and longevity of the subsea pipeline. UDMC’s team of skilled welders used state-of-the-art equipment to guarantee precision and reliability in every joint.
- Hydrostatic Testing: Following pipe welding, hydrostatic testing was carried out on the pipe spools to verify their strength and ability to withstand pressure. This testing was vital to ensuring the pipeline’s operational safety and performance.
- Concrete Collars and Pipe Launching: To secure the pipeline and protect it against external pressures, UDMC undertook the installation of concrete collars. These collars helped to stabilize the pipeline in the trench and were a critical element during the pipe launching process.
Dredging of Pipeline Trench: In accordance with approved levels, UDMC performed dredging to create the necessary trench for the subsea pipeline. This operation was executed with meticulous attention to detail, ensuring the trench was prepared for the proper installation of the pipeline.
Diving and Survey Operations: Diving teams were deployed throughout the duration of the project for subsea operations, including the survey of the pipeline route. Their work was essential for the accurate placement and alignment of the pipeline along the seabed.
- Installation of Pipeline: With the trench and preparatory work completed, UDMC’s team undertook the careful installation of the pipeline into the prepared trenches. This step required precise coordination between the on-site team and the diving crew to ensure accurate placement.
- Outfall Diffuser System: As part of the final installation, UDMC supplied, fabricated, and installed the outfall diffuser system.
- Backfilling of Pipeline Trench: Once the pipeline was in place, the trench was backfilled using a mixture of imported gravel, rocks, and natural fill. This backfilling process helped to protect the pipeline and maintain the structural integrity of the seabed.
- Disposal of Excess Natural Fill Material: Finally, UDMC was responsible for the proper disposal of excess natural fill material, ensuring that the site was cleared and restored in compliance with environmental regulations.
Conclusion
The successful completion of the 2km subsea TSE outfall pipeline is a testament to the careful planning, execution, and expertise of UDMC. The project was meticulously executed to meet both technical specifications and safety standards. The project has now provided a crucial piece of infrastructure for the disposal of treated sewage effluent, contributing to the overall improvement of environmental sustainability and public health in the region.
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